Siemens Industrial Ethernet Switches SCALANCE X-200 - Manual (Page 154)

Configuration / diagnostics using remote mechanisms
6.1 Assignment of an IP address
SCALANCE X-200
154
Operating Instructions, 12/2011, A5E00349864-19
6.1.3 Configuration with DHCP
The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows the dynamic
configuration of IP addresses and provides additional information.
During initial startup, the network node registers with a server that provides the DHCP
service. The server assigns a free IP address so that at the next startup, a connection is not
absolutely necessary.
Properties of DHCP
● The use of DHCP is not restricted to the startup phase. DHCP can also be used during
operation.
● The IP address remains valid for a period set by the DHCP server known as the "lease
time". When this expires, the DHCP server must be requested to assign an IP address
again.
● Generally, there is no fixed address assignment; in other words, when a client requests
an IP address again, it is normally assigned a different address. It is, however, possible to
configure the DHCP server so that it makes a fixed address assignment.
RFC - Request for Comments
The following RFC can be downloaded from the Internet:
RFC 2131 - Dynamic Host Configuration Protocol